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Vectors vecC and vecD have magnitudes of...

Vectors `vecC and vecD` have magnitudes of 3 units and 4 units, respectively. What is the angle between the directions of `vecC and vecD` if `vecC.vecD ` equals (a) zero, (b) 12 units , and (c ) -12 units ?

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`(a) 0^(@) or 180^(@) ,(b) 90^(@)`
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